长江中下游九瑞矿集区宝山铜多金属矿床辉钼矿Re-Os年龄及其地质意义
장강중하유구서광집구보산동다금속광상휘목광Re-Os년령급기지질의의
Re-Os age of molybdenite from the Baoshan copper polymetallic deposit in the Jiurui ore concentration area along the middle-lower Yangtze River region and its geological significance
  • 万方数据
    中国地质 중국지질
    CHINESE GEOLOGY
    2015年 2期 585-596 ,共12页

    胡正华%王先广%李永明%刘善宝%张家菁%陈毓川%曾庆权%王艺云%蒋金明%聂龙敏%雷天浩%胡文洁%张芳荣%吴施金%沙珉%龚良信%谢瑞丰%文亮先

    호정화%왕선엄%리영명%류선보%장가정%진육천%증경권%왕예운%장금명%섭룡민%뢰천호%호문길%장방영%오시금%사민%공량신%사서봉%문량선

    辉钼矿%Re-Os同位素%成矿年龄%宝山%九瑞矿集区 輝鉬礦%Re-Os同位素%成礦年齡%寶山%九瑞礦集區
    휘목광%Re-Os동위소%성광년령%보산%구서광집구
    molybdenite%Re-Os isotope%ore-froming age%Baoshan%Jiurui area
    九瑞地区斑岩-矽卡岩型矿床是长江中下游地区Cu-Au-Mo(Fe)多金属成矿带的重要组成部分,宝山铜多金属矿床是江西省实施找矿突破战略以来,在九瑞矿集区界首—大桥背斜核部新发现的首个中型以上斑岩-矽卡岩型铜多金属矿床。本文利用辉钼矿Re-Os同位素定年方法对宝山矿床进行了成矿时代的研究,获得了6件辉钼矿Re-Os同位素模式年龄为(147.2±3.6) Ma~(150.5±2.7) Ma,加权平均年龄为(148±1) Ma, MSWD=1.03。6件样品其等时线年龄为(148.6±2.6) Ma, MSWD=1.9,代表了宝山矿床的成矿时代,与九瑞矿集区其他斑岩-矽卡岩型铜多金属矿床(武山、城门山、湖北丰山洞、鸡笼山、宋家冲、邓家山、通江岭)以及长江中下游地区鄂东南、铜陵矿集区斑岩-矽卡岩铜多金属矿床的形成时代高度一致,它们均为中国东部EW特堤斯构造域向NE古太平洋构造域大转折背景下,软流圈上涌和玄武质岩浆底侵而导致壳幔同熔所引起的燕山期花岗质岩浆岩活动的产物。
    구서지구반암-석잡암형광상시장강중하유지구Cu-Au-Mo(Fe)다금속성광대적중요조성부분,보산동다금속광상시강서성실시조광돌파전략이래,재구서광집구계수—대교배사핵부신발현적수개중형이상반암-석잡암형동다금속광상。본문이용휘목광Re-Os동위소정년방법대보산광상진행료성광시대적연구,획득료6건휘목광Re-Os동위소모식년령위(147.2±3.6) Ma~(150.5±2.7) Ma,가권평균년령위(148±1) Ma, MSWD=1.03。6건양품기등시선년령위(148.6±2.6) Ma, MSWD=1.9,대표료보산광상적성광시대,여구서광집구기타반암-석잡암형동다금속광상(무산、성문산、호북봉산동、계롱산、송가충、산가산、통강령)이급장강중하유지구악동남、동릉광집구반암-석잡암동다금속광상적형성시대고도일치,타문균위중국동부EW특제사구조역향NE고태평양구조역대전절배경하,연류권상용화현무질암장저침이도치각만동용소인기적연산기화강질암장암활동적산물。
    Porphyry-skarn deposits in Jiurui area constitute an important part of the middle-lower Yangtze River Cu-Au-Mo (Fe) polymetallic ore belt. Since the implementation of the prospecting breakthrough strategy, the Baoshan deposit has been the first medium-size porphyry-skarn copper polymetallic deposit discovered at the core of Jieshou-Daqiao anticline in Jiurui area. In this paper, molybdenite Re-Os dating was used to study the mineralization time of the Baoshan deposit and, as a result, six molybdenite Re-Os model ages of 147.2±3.6 Ma to 150.5±2.7 Ma and weighted average age of 148±1 Ma (MSWD=1.03) were obtained. These six molybdenite Re-Os model ages yielded an isochron age of 148.6±2.6 Ma (MSWD=1.9), which represents the ore-forming age of the Banshan deposit. The ore-forming age of the Baoshan deposit is similar to ages of other porphyry-skarn type copper polymetallic deposits in Jiurui area (e.g., Wushan, Chengmenshan, Fengshandong of Hubei, Jilongshan, Songjiachong, Dengjiashan and Tongjiangling), as well as in Tongling and southeastern Hubei areas within the middle-lower Yangtze River region. All of them are products of granitic magma activities related to the crust-mantle syntexis resulting from the upwelling asthenosphere and the underplating basaltic magma in the Yanshanian period.
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